Quasi-cyclic low density odd-even check code belief propagation decoding method based on oscillation

A technology of low-density parity and belief propagation, which is applied in the field of quasi-cyclic low-density parity-check code belief propagation decoding based on oscillation, which can solve the problems of high decoding complexity and difficult realization.

Inactive Publication Date: 2013-08-21
XIAN UNIV OF TECH
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[0014] The purpose of the present invention is to provide a quasi-cyclic low-density parity-check code belief propagation deco...

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  • Quasi-cyclic low density odd-even check code belief propagation decoding method based on oscillation
  • Quasi-cyclic low density odd-even check code belief propagation decoding method based on oscillation
  • Quasi-cyclic low density odd-even check code belief propagation decoding method based on oscillation

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Embodiment Construction

[0063] The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

[0064] Oscillation-based quasi-cyclic low-density parity-check code belief propagation channel decoding method, including:

[0065] Step 1: Initialize the external information that each variable node transmits to each check node connected to it; initialize the external information value that the check node transmits to the variable node connected to it;

[0066] Lq ( i ) = L ( P i ) = 2 y n δ 2 , i = 1,2 , … , N

[0067] Step 2: At the beginning of the iterative process, fi...

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Abstract

The invention discloses a quasi-cyclic low density odd-even check code belief propagation decoding method based on oscillation. In the initial iteration, a mean value is used for obtaining normalizing factors alpha and beta, under different signal-to-noise ratios, an extrinsic information value of a check node is dynamically corrected to reduce fluctuation of the extrinsic information value of the check node, the quasi-cyclic low density odd-even check code belief propagation decoding method unites a bit flip method in hard decision decoding to reduce occurrences of the oscillation, decoding performance of transmission data can be improved, and decoding complexity can be reduced. Decoding methods of soft decision and hard decision are combined to obtain big decoding gains. Balancing states of complexity and decoding efficiency of a decoder are achieved due to the facts that combination of low density odd-even check code hard decision decoding and low density odd-even check code soft decision decoding and excellent coding gains of a soft decision belief propagation algorithm are utilized, and a hard decision decoding method is fully applied to reduce influences of accumulated error code words.

Description

technical field [0001] The invention belongs to the technical field of digital communication, and in particular relates to an oscillation-based quasi-cyclic low-density parity-check code belief propagation decoding method. Background technique [0002] In a communication system, channel decoding improves the stability of data transmission in the entire system when a large amount of data is transmitted in the channel and encounters many interferences that cause data attenuation. The signal generator will generate source information, encode and map the source information, and send it to the modem via the carrier wave. After receiving it at the receiving end, it will go through a series of demodulation and decoding operations to obtain the decoded codeword. [0003] Advanced channel decoding technology is one of the core technologies in today's 4G&5G communication systems. It has developed rapidly in the past few decades. With the development of mobile communications, people ha...

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Application Information

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IPC IPC(8): H03M13/11
Inventor 张发存杨发霞
Owner XIAN UNIV OF TECH
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